неправильное слово и время. Лучше "I can't believe it's happening"
here are wizards I the hp world
очепятка. "in the hp world"
Rowling isn't killing people because they are of another nation or because they are communists. She ISN'T a fascist.
Тут лучше Simple. "Rowling doesn't kill people...". И я бы от себя поменял на: "Rowling neither kills peopleof any race/religion/gender/etc. nor calls others to do so"